Rock-drill.



ROCK DRILL,

FILED MA APPLIGATON WIT/P58358 Lato ' chamber 5 nf the casing will controls the seid passage. The valve has "a i l2.' tli plunger is oif vnormal cross seat-inn lumber 6 or ilie casing. The o nrrn FFE.

THDES J". BARBRE AND JAMES G. TSEFZ.' F DENIE', GQ39245539, ASSGNORS TO CORPORATION Specification of Application filed llay i5, 19M.

4fo all whom it may concern. l

Be it known that We, THOMAS J. lnnnnn States, and residents of Denver, county .of

near the reduced pori'ion 1Q, und Willi longiimlmul passages 26, leading Yfrom ille A lmnille 2O is provided for handling ilio lrill, and un oil reservoir 2l is provided in and JAMES Gr. TREFZ citizens of the 'Uniefl ooeninv' l) to the rear end of the y)lunffeiz a r n l n lenver, and State of Colorado, have in vented certain new and useful inpro\'ements in Roololrills, of Wliioli the iiollowing is a Specilicaiion. l

Uur yinvenihion is an improvement in rook drillsq o'l the valreless piston hammer lypgl aobiiaiecl by fluid under pressure, and llas l for its oljeot a Simpliionion of C-onsirncl tion and an increase of elicieneyv l; in ille drawings, Figure i i5 n. longiburli nal ect-ion of the iniproivein-en. Fig. View at right angles to Fig. l. l i. inthe pre-Sent emlrofliinent oi' lille inren l rion, n' 1 g l is proviclefl. haring ai. one encl a cimeli 2 for liolcling the loolv ncl linxing :i chamber 3 aojanent to the. inne enel of lle clniok, in wliion nioifes the hun@ f-l. Near its opposite enel, one casing is pro mori i wlli n. pnsssage 5, in its Wall, communie ring l al. one end with a cliiiznber in lie unil it its opposite @ml Wil'a lire inle; pipe Z7 for the :llnil under pressure. l *faire S is rotatable in Valve casing in a. recess arrange@ 'tra rersel'y tlionassage, nml

'ransverse @pr ing 9i, which, when ii valve is in ille poSirion of l7 admits lo Julie chamber 6. `'.lie @asini is arrange-; rnisveimly oi ille rear end of iii-:3 mi

` The valve is opi-ninte. by a lun onelsirle ille Casing., is lielcl in place by n. nui; ll at lie opposite sigle.y 'lli ger', of which 'the hammer i a. p flared behind tlielmnnner ns indi si and lli@ bore or chamber of lthe ori-Qing i fluoerl to lillie plunger.l Al rne inner enr oi". the reduced portion, the cti-imberor more in enlarged., as indicated at 13 @nel the ing is provirle with an exhaust opening 14,

charmer.

for somo flisianoo as infliontnd their enlnrge. indicarne, Inl,

this point is also provided. wiwi a. spiral passing@ l?, and n, i

,formed in ille nl'. the

he vulve oni-sing C0 which ilio anillo 2O also Connected. EL plug' Q3 is {ln-omini! into a iillinf; opening ol' llie Tnlve easing for el `Vsinn the saine. and it will be noticed llini: elle e 8 exieniln into i-lie oil reservoir ac one l nml in pro iriel 'Willi n groove or recess for ruling' 'up :i portion of tlio oil,

"when the vulve. is "Lr-.rmx` lr. will be eviwhen the caire iurneil. the oil ine "'roove -will be '(lilrilinleil on "die wan o; ille reoessin which Ille valve held, will retain alie valve perleoiflj/ lubricated. A eefl tube is threaded. nl irs inner @nel in'o valve easing in aline 'easinff l. and the Casing l.

nieni with Lne l valve cnrurf 32 um. ieeil lube 27 nre lielfl tog'eilrer liyzilolts 2S, which extend Miro-gli lar-eral e and BO on the easing 'lyvnlre casing F22, respectively, and nre en nuts Sl io 'hold ilie 1nolis in plnoo.

gagged. hv

n. spring Q8 is arranged on each boli, 'bexoen the houd thereof, amil flier adjacent lng?) on lxe u A feed piston 82 is uri-sr Agesl in ilie. tube, nml is extended ont oi'. the tube atA rear end.y and pointed at 33 to engage n. snpporb. The pision iceeils the drill in the usual manner.

En opemiion. when die plunger or piston in forward 'posiiiorn the 'luid being' zulinirierl through ilio valve. S to the passage enters ille chamber (5 anal :wis upon the shoulder of rlin plunger, \\"-'f;z A urniefl beiween Lilie portions l5 nml 'lo @i i e plink ger, o loro@ ille Said plungor ron.

soon :is the plissage` or opening' i9 is moved oni of the chamber 6, the snicl pasis closed by the casing walls. but until this occurs, the Space in the casing at the rear of ille plunger is in Communication will; exlmust rlironglr 'the passages QG of ille plunger. lvliien the slionlcler nni'lre. orn'nril endl of the ooimnence- .nient @if the sniml passage l?, the motive fluid is nenni verl lo lili@ said and irme-ls g lle same lo the rear olf the "piston 'f saine 'Tire il engl of n D W will? r...

'Les ille said raar enfl at the inner end ofA the tool held in the chuck 2, when the portion lll of the piston, in its outward movement cuts the communication between the chamber and the passage 17, the motive fluid cut off' from the space in rear of the piston, and at the saine time the passage lt) enters the chaiuber lil, and places the said space in eonimunieation with the exhaust.

le claim :M

l. A. device ol' the character Ispecified, conij'irising a casing, a piston slidable therein.` and lniving an enlarged inner end to form a shoulder between the said enlarged end and the main portion, said piston having a longitiulinal passage leading` from its innerend toward the outer end. and opening laterally adjacentto the said outer end, the casing having a chamber near the forward end of' the plunger, and an exhaust opening leading troni the chamber a nd having an inlet jnissage for the motive fluid and a chainber into which the pa: age opens, said chainber being at a point adjacent. to the shoulder ot" the piston when the said piston is in its outermost, position, the said casing having an internal spiral rwove forming a passage t'or the motive fluid and leading Yfrom the inner end thereof toward the Front and stop ping short of the Chamber into which the inlet passage opens.

ln a device of the character a casing a piston slidable therein and having a hammer at: itsI outer end and an airiuilar shoulder near the inner end, the casing having an inlet ehan'iber between the shoulder and the hammer, and an exhaust chainber near the hammer, said piston having a longitudinal passage leading from the end adjacent to the shoulder and having a lateral outlet opening into the exhaust chamber when the piston is at the end of its outward stroke, said casing having an internal spiral passage leading from the inner end to a point near the inlet chamber and coniuinnieating therewith when the shoulder has uncovered the said passage.

3. A device of the character specified, comprising a casing, a piston movable therein, the inner end of' the piston being enlarged to forni an annular shoulder between the enlarged j'iortiion and the lnain portion, said easiiig having a chamber in which the said enlarged'end moves. and having an inlet passage at the end of the chamber adjacent to the shoulderflo admitting the niotive fluid to act; upon the shoulder, said casing having an internal spiral groove ferne ing a passage for conducting the inotive fluid from the inlet passage to the opposite specified,

spiral passage leading t'roin a,

opening into the exhaust chamber when the piston is atV the limit'l ol" its outward stroke. -'l-. ln a device of th(` character specified,

vthe combination with the cvlinder or casing,

ot a piston movable therein. the inner end ot the easing being;r enlarged annularlj', and the piston having an annular rib fitting the enlarged portion, said casing having an inlet opening at the outer end of the enlarged pei-tion and a spiral passage leading: from a point adjacent to the inlet opening to the inner end ot' the casing. said piston having an exhaust opening extending'substantially longitlulinal thereof, and the easing having an outlet eonimunieating tta-rewith whenthe piston is al the end ol the outward stroke. ln a device of the character specified, a casing having one end open and having its inner end enlarged aiinularlv. said casinghaving an inlet opening near the outer end of the enlarged portion, and an internal point adja cent to the said opening to the inner end of the casing, and a piston havin;r an annular rib near its inner end fitting the enlarged portion, Said casing having an exhaust pas sage uncovered by the piston at the end of its outward stroke.

G. A device of the character specified,

comprising a casingr having one end open 4and having the other end closed and enlarged annularly, the easing having an inlet opening for the motive fluid near the outer end of the enlarged portion, and an internal spiral groove leading from a point adjacent to the said opening t-o the inner end of the casing, a piston having an annular rib at its inner end fitting the enlarged portion for closing the communication between the inlet and the adjacent end of the passage when the piston is near the `end of its outward stroke, and for placing the inlet. in communication with the adjacent end of the groove when the piston is near the end of its inward stroke, the casing having an exhaust passage uneoveredby the piston at the end of its outward.stroke.

`THOMAS J. BARBRE.

JAMES G. TREFZ. lVitnesses: i

O'rro Koen', j EUGENE ELDER. 

